Issue #16855 has been updated by ko1 (Koichi Sasada).
please write a specification of your proposal. there is only a code, test and motivation.
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Feature #16855: Add a tracepoint for warnings
https://bugs.ruby-lang.org/issues/16855#change-85603
* Author: tenderlovemaking (Aaron Patterson)
* Status: Rejected
* Priority: Normal
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I would like to add a tracepoint for warnings. I want to do this so that DidYouMean can suggest fixes for instance variables. I noticed did you mean [has experimental support](https://github.com/ruby/did_you_mean/blob/master/lib/did_you_mean/experimental/ivar_name_correction.rb), but it looks very complicated. I think if we added a tracepoint for such warnings, DidYouMean can provide more helpful warnings.
I made a pull request [here](https://github.com/ruby/ruby/pull/3106)
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